Did you try repairing or reinstalling Excel?
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Ƭᴇcʜιᴇ007Dec 29 '12 at 18:56

Hi, thanks for reply. It was installed when i bought the machine. For now I don't have office licence and until I buy a new one i need to use this installed version.
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Timur Aykut YILDIRIMDec 29 '12 at 19:02

Click the Start button and open the "Control Panel."
Step 2
Click the "Uninstall a program" link under Programs.
Step 3
Scroll down and highlight "Microsoft Office."
Step 4
Click the "Change" button and wait for a new window to open.
Step 5
Click to select the "Repair" option and click "Continue" to authorize your computer to repair Microsoft Excel to its default settings.